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/*Copyright (c) 2011, Florent DEVILLE.                                      */
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#pragma once

#include "RTIPrimitive.h"

namespace RT
{
	/*Cylinder primitive*/
	class RTPrimCylinder : public RTIPrimitive
	{
	private:
		/*Cylinder's radius*/
		F32 m_radius;

		/*Cylinder's height*/
		F32 m_height;

	public:
		/*Constructor*/
		RTPrimCylinder(F32 radius, F32 height);

		/*Destructor*/
		~RTPrimCylinder();
	
		/*Calculate the intersection between a ray and the cylinder*/
		bool intersect(const RTRay& ray, F32& dist, bool useGlobalCoordinates);

		/*Calculate the cylinder normal*/
		void computeNormal(const RTRay& ray, F32 dist, RTVector3f& normal)const;

		/*Check if the point is inside the cylinder*/
		bool isInside(const RTVector3f& p)const;


	private:
		/*Check if the height is valid*/
		bool isValideHeight(F32 h)const;

		/*Calculate the intersection between the ray and the cylinder*/
		bool calculateTFromHeight(const RTRay& ray, F32* t)const;

		/*Calculate the interesection between the ray and the top cap*/
		F32 calculateTTopEnd(const RTRay& R)const;

		/*Calculate the interesection between the ray and the bottom cap*/
		F32 calculateTBottomEnd(const RTRay& R)const;

		/*Return the minimum between f1 and f2*/
		F32 fmin(F32 f1, F32 f2)const;
	};
}